Update mcr.microsoft.com/dotnet/sdk:9.0.203-noble Docker digest to c849687

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.devcontainer/Dockerfile

@@ -1,5 +1,5 @@
 # Refer to https://hub.docker.com/_/microsoft-dotnet-sdk for available versions
-FROM mcr.microsoft.com/dotnet/sdk:9.0.203-noble@sha256:2c9a4956a61fc45d9111fb36ec9fb86932e4842af9eb9bc9306bf8757f53674d
+FROM mcr.microsoft.com/dotnet/sdk:9.0.203-noble@sha256:c84968764a7d265a29cc840096750816d82655369d6ad03bcdf65f790684fd21
 
 # Installing mono makes `dotnet test` work without errors even for net472.
 # But installing it takes a long time, so it's excluded by default.